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<title>How To Include This Module</title>
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<h1><a href="../index.html">
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</a></h1>
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<ul><li><a href="../index.html">home</a></li>
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</ul><h2>Compiler</h2><ul>
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<li><a href="../structure.html">structure</a></li>
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<li><a href="../inform7n.html">inform7</a></li>
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<li><a href="../intern.html">inter</a></li>
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<li><a href="../services.html">services</a></li>
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</ul><h2>Other Tools</h2><ul>
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<li><a href="../inblorbn.html">inblorb</a></li>
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<li><a href="../indocn.html">indoc</a></li>
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<li><a href="../inform6.html">inform6</a></li>
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<li><a href="../extensions.html">extensions and kits</a></li>
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</ul><h2>Repository</h2><ul>
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<li><a href="https://github.com/ganelson/inform"><img src="../docs-assets/github.png" height=18> github</a></li>
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</ul><h2>Related Projects</h2><ul>
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<li><a href="../../../inweb/docs/index.html">inweb</a></li>
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<li><a href="../../../intest/docs/index.html">intest</a></li>
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<main role="main">
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<!--Weave of 'How To Include This Module' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../services.html">Services</a></li><li><a href="index.html">lexicon</a></li><li><a href="index.html#P">Preliminaries</a></li><li><b>How To Include This Module</b></li></ul></div>
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<p class="purpose">What to do to make use of the lexicon module in a new command-line tool.</p>
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<ul class="toc"><li><a href="P-htitm.html#SP1">§1. Status</a></li><li><a href="P-htitm.html#SP2">§2. Importing the module</a></li><li><a href="P-htitm.html#SP3">§3. Defining parsing methods</a></li><li><a href="P-htitm.html#SP4">§4. Using callbacks</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Status. </b>The lexicon module is provided as one of the "services" suite of modules,
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which means that it was built with a view to potential incorporation in
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multiple tools. It can be found, for example, in <a href="../inform7/index.html" class="internal">inform7</a> and
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<a href="../linguistics-test/index.html" class="internal">linguistics-test</a>.
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</p>
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<p class="commentary">By convention, the modules considered as "services" have no dependencies on
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other modules except for <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a> and other "services" modules.
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</p>
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<p class="commentary">A tool can import <a href="index.html" class="internal">lexicon</a> only if it also imports <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a>,
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<a href="../words-module/index.html" class="internal">words</a>, <a href="../syntax-module/index.html" class="internal">syntax</a> and <a href="../inflections-module/index.html" class="internal">inflections</a>.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Importing the module. </b>We'll use the term "parent" to mean the tool which is importing <a href="index.html" class="internal">lexicon</a>,
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that is, which will include its code and be able to use it. As with any
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imported module,
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</p>
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<ul class="items"><li>● The contents page of the parent's web must identify and locate the
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module:
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</li></ul>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="element-syntax">Import</span><span class="plain-syntax">:</span><span class="string-syntax"> somepath/lexicon</span>
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</pre>
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<ul class="items"><li>● The parent must call <span class="extract"><span class="extract-syntax">LexiconModule::start()</span></span> just after it starts up, and
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<span class="extract"><span class="extract-syntax">LexiconModule::end()</span></span> just before it shuts down. (But just after, and just
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before, the corresponding calls to <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a>.)
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</li></ul>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. Defining parsing methods. </b>When lexicon entries are registered (see <a href="1-lxc.html" class="internal">Lexicon (in lexicon)</a>), they are
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assigned "meaning codes", and these affect the way that parsing is done.
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The user should define <span class="extract"><span class="extract-syntax">EXACT_PARSING_BITMAP</span></span>, <span class="extract"><span class="extract-syntax">SUBSET_PARSING_BITMAP</span></span>
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and <span class="extract"><span class="extract-syntax">PARAMETRISED_PARSING_BITMAP</span></span> to be sums of the meaning codes for
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which these methods are used — see <a href="2-pe.html" class="internal">Parse Excerpts</a>.
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</p>
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<p class="commentary">For example, the parent could define <span class="extract"><span class="extract-syntax">INGREDIENTS_MC</span></span> and <span class="extract"><span class="extract-syntax">RECIPES_MC</span></span> to
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have two different namespaces, and then define <span class="extract"><span class="extract-syntax">EXACT_PARSING_BITMAP</span></span> to
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be <span class="extract"><span class="extract-syntax">INGREDIENTS_MC + RECIPES_MC</span></span> to make both of them parsed exactly.
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</p>
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<p class="commentary">Mimimal default settings are made if the parent doesn't create these
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constants.
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</p>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Using callbacks. </b>Shared modules like this one are tweaked in behaviour by defining "callback
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functions". This means that the parent might provide a function of its own
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which would answer a question put to it by the module, or take some action
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on behalf of the module: it's a callback in the sense that the parent is
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normally calling the module, but then the module calls the parent back to
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ask for data or action.
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</p>
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<p class="commentary">The parent must indicate which function to use by defining a constant with
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a specific name as being equal to that function's name. A fictional example
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would be
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="function-syntax">@d</span><span class="plain-syntax"> EXPRESS_SURPRISE_LEXICON_CALLBACK Emotions::gosh</span>
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<span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="element-syntax">void Emotions:</span><span class="plain-syntax">:</span><span class="string-syntax">gosh(text_stream *OUT) {</span>
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<span class="plain-syntax"> WRITE("Zowie!\n");</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<p class="commentary">The lexicon module has many callbacks, but they are all optional. The
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following alphabetical list has references to fuller explanations:
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</p>
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<ul class="items"><li>● <span class="extract"><span class="extract-syntax">EM_CASE_SENSITIVITY_TEST_LEXICON_CALLBACK</span></span>, <span class="extract"><span class="extract-syntax">EM_ALLOW_BLANK_TEST_LEXICON_CALLBACK</span></span>
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and <span class="extract"><span class="extract-syntax">EM_IGNORE_DEFINITE_ARTICLE_TEST_LEXICON_CALLBACK</span></span> can all make excerpts
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parse in slightly different ways. <a href="../core-module/index.html" class="internal">core</a> sets all of these to return <span class="extract"><span class="extract-syntax">TRUE</span></span>
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for say phrases, and <span class="extract"><span class="extract-syntax">FALSE</span></span> for everything else. See <a href="1-lxc.html#SP3" class="internal">Lexicon::retrieve</a>
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and <a href="1-lxc.html#SP1" class="internal">Lexicon::register</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">PARSE_EXACTLY_LEXICON_CALLBACK</span></span> is called when an excerpt is about to be
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parsed in "subset mode" — allowing just a subset of its words to be used,
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i.e., not requiring exact wording. This function can refuse to allow that in
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certain cases. See <a href="1-lxc.html#SP3" class="internal">Lexicon::retrieve</a>.
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</li><li>● <span class="extract"><span class="extract-syntax">PROBLEM_LEXICON_CALLBACK</span></span> is called when an error is found, and can
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prevent this from being issued to the terminal as an error message: see
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<a href="2-em.html#SP13" class="internal">ExcerptMeanings::problem_handler</a>.
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</li></ul>
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